Perovskite Electrode Catalyst Exsolution via Electric Potential

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Solution Overview

Problem

Current methods for producing electrode materials for solid oxide cells face challenges in achieving high electrochemical performance, durability, and cost-effectiveness, often requiring lengthy processes and resulting in unimpressive electrochemical performance due to slow ion diffusion and limited surface particle population.

Innovation Solution

Applying an electric potential to a perovskite metal oxide to enhance exsolution, resulting in a rich nanostructure with outstanding electrochemical activity and stability, significantly accelerating the process by more than two orders of magnitude and increasing surface metal particle population and performance by one order of magnitude.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If traditional perovskite metal oxide reduction by H2 is used, then the process is simple, but the production time is lengthy (10-30 hours) due to slow ion diffusion

Engineering Contradiction:

Improveproduction timeVSAvoidion diffusion rate

Core Design Contradiction:

ProductivityVSSpeed

Solution Approach 1:

The patent replaces the chemical reduction mechanism (H2 diffusion) with an electrical field-driven mechanism. By applying an external electric potential, metal ions are rapidly extracted from the perovskite lattice through electrochemical reactions at the electrode interface, eliminating the need for slow thermal diffusion processes and reducing production time from 10-30 hours to minutes.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the fundamental parameter driving the reduction process from chemical potential (H2 concentration gradient) to electrical potential (applied voltage). This parameter change enables precise control over the extraction rate and allows the process to proceed at much higher speeds without compromising the quality of the resulting metal particles.

Inventive Principle:

Principle #35Parameter changes

2Quantity of substance

If traditional reduction methods are used, then the process is cost-effective, but the surface metal particle population is limited

Engineering Contradiction:

Improvesurface metal particle populationVSAvoidmanufacturing complexity

Core Design Contradiction:

Quantity of substanceVSEase of manufacture

Solution Approach 1:

The patent performs preliminary electrical treatment on the perovskite material before final electrode fabrication. By pre-extracting metal ions and forming nuclei in controlled quantities through electrical potential application, the material is prepared in advance with optimized particle distribution, which simplifies subsequent manufacturing steps and ensures high surface particle population without increasing overall complexity.

Inventive Principle:

Principle #10Preliminary action

3Reliability

If traditional reduction by H2 is used, then the process is simple, but the electrochemical performance is unimpressive

Engineering Contradiction:

Improveelectrochemical performanceVSAvoidprocess complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent introduces an electrical field as an intermediary mechanism between the perovskite material and the final electrode product. This intermediary enables precise control over metal ion extraction, allowing optimization of particle size, distribution, and crystallinity - all critical factors for electrochemical performance - while maintaining a relatively simple overall process workflow.

Inventive Principle:

Principle #24Intermediary (Mediator)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The method enables the rapid generation of densely populated small metal particles on the lattice surface, enhancing electrochemical performance and stability, and can regenerate deteriorated electrode catalysts, offering a cost-effective and time-efficient solution for solid oxide cell production.

Implementation Method 1

applied electrical potentials can be instrumental in controlling the driving force for exsolution of metal in perovskite metal oxides

Methodology Applied

Scientific EffectExsolution:

Implementation Method 2

applying an electrical potential to the perovskite metal oxide can enable exsolution that is faster by more than two orders of magnitude

Methodology Applied

Scientific EffectElectrochemical reaction:

Data Source

PatentEP3482439B1Method for producing an electrode catalyst from a perovskite metal oxide

Publication Date: 2022.03.09 UNIV COURT OF THE UNIV OF ST ANDREWS

Figure 1a~1c
Figure 1d
Figure 1(e)~1(g)

AI summary

The invention relates to a method of producing electrode materials for solid oxide cells which comprises applying an electric potential to a metal oxide which has a perovskite crystal structure. The resultant electrode catalyst exhibits excellent electrochemical performance. The invention extends to the electrode catalyst itself, and to electrodes and solid oxide cells comprising the electrode catalyst.